package com.qjc.excel.utils;

import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;

/**
 * @Description:
 * @Author: qjc
 * @Date: 2019/11/27
 */
public class ExcelUtil {

    /**
     * 导出数据到Excel
     *
     * @param list           数据集合
     * @param title          数据第一行标题
     * @param sheetName      Sheet名称
     * @param pojoClass      实体Class
     * @param fileName       文件名
     * @param isCreateHeader 是否创建数据表头
     * @param response       响应
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);

    }

    /**
     * 导出数据到Excel
     *
     * @param list      数据集合
     * @param title     数据第一行标题
     * @param sheetName Sheet名称
     * @param pojoClass 实体Class
     * @param fileName  文件名
     * @param response  响应
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response)
            throws Exception {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
                                      ExportParams exportParams) {
        Workbook workbook = null;
        try {
            workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (workbook != null)
            try {
                downLoadExcel(fileName, response, workbook);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook)
            throws Exception {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            throw new Exception(e.getMessage());
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response)
            throws Exception {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null)
            ;
        downLoadExcel(fileName, response, workbook);
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass)
            throws Exception {
        if (org.apache.commons.lang3.StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new Exception("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception(e.getMessage());
        }
        return list;
    }

    /**
     * 导入(解析)Excel
     *
     * @param file       Excel文件
     * @param titleRows  标题行数
     * @param headerRows 表头行数
     * @param pojoClass  实体类
     * @param <T>
     * @return
     * @throws Exception
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)
            throws Exception {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new Exception("excel文件不能为空");
        } catch (Exception e) {
            throw new Exception(e.getMessage());
        }
        return list;
    }

}
